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If any of the following conditions are detected, the printer indicates a fuser error:
1. If the thermistor detects the temperature has not risen by 20º C for 50 msec. within 12 to 30 sec.
after warm up. (This error applies only when the thermistor detects a temperature of 90º C or less.)
2. If the thermistor detects that the temperature has not reached 172º C within 60 sec. after warm
up.
3. Except in pause mode (see the note below), if the thermistor detects that the temperature in the
idle state has fallen to 80º C or lower for 50 msec., or the temperature during printing has fallen
to 133º C or lower.
4. The thermistor detects that the temperature has exceeded 193º C for 50 msec. during
temperature
control.
Note: Pause Mode: In this mode, the control temperature is decreased to save power in the idle
state, the heater lamp is turned OFF.
Thermo fuse TF1 cuts power if the temperature of the fusing section rises to an abnormally high
level (over 200° C, 392° F).
2.1.2.4 Scanner Motor Control
Figure 2-16 is the scanner motor (M2) control circuit. The scanner motor is driven while it receives
the POLYGON CTL signal. Motor rotation speed is 8622 rpm
If the any of following conditions are detected, the printer indicates a scanner motor error:
1. The SSCAN signal has not been given once within 1 sec. after the scanner motor is energized.
2. The number of scanner motor rotations has not stabilized within ± 0.5 rpm by 4.2 sec. after the
motor is energized.
3. The number of scanner motor rotations has exceeded ± 3% for more than 0.5 sec. after the motor
is energized, even if the rotation number stabilizes within ± 0.5 rpm.
+24V
GND2
5
4
3
2
1
CN210
Main Board
(C169 MAIN-B)
Scanner Motor
M2
NC
+5V
P_CTL
Figure 2-16. Scanner Motor Control Circuit
Operating Principles EPL-5500 Service Manual
2-12 Rev. B